Well.. I told myself NO MORE bettas, as I already have 13 shipping out to buyers and one older guy (Cornelias) and 12 sorority girls.... But I just cant help myself.
I took a trip to my local walmart today and came across a cup with a inch of green water on the betta shelf...I took a closer look and there was a poor little guy swimming around in it! I was horrified! I watched him for a min. or so...and noticed that he was swimming in a tight circle nipping at what was left of his tail. I also noticed that he had redish gills (due to water quality)
So I took him home.. Housed him in a 1.5g bowl with a heater (81degrees) added some aqua salt and some Ich away, and sat him by Cornelias.
He is eating pellets as well as bloodworms and is swimming, not well, as his whole tail is gone, but he is swimming.
Also. I havent seen him nip at his tail since I brought him home..So im hoping that will stop for good. But his gills are still that reddish color...Will the aqua salt take care of that, or should I add something else as well.

I think good, clean water will help his gills clear up eventually, as well as stave off infection in his tail. Sounds like his biting was stress/boredom induced, so he may never bite again now that you're keeping him in the right environment.